Subject: Re: [stella] Pitfall! LFSR From: "Dennis Debro" <dnsdebro@xxxxxxxxxxx> Date: Mon, 10 Sep 2001 11:27:21 -0400 |
Now you know this question was coming...could you post the flash file or was it included with "Stella Gets a New Brain"? ----- Original Message ----- From: Glenn Saunders <cybpunks2@xxxxxxxxxxxxx> To: <stella@xxxxxxxxxxx> Sent: Monday, September 10, 2001 5:04 AM Subject: Re: [stella] Pitfall! LFSR > At 10:41 AM 9/10/2001 +0200, you wrote: > >As I'm just finishing the Pitfall! disassembling, I would like to know, if > >David has a name for that special LFSR. > > LFSR is a modern term for it, but in the Atari days they called all this > stuff, whether in software or hardware (like the 2600's horizontal motion > and audio circuitry), polynomial counters. > > He called it an 8-bit polynomial counter and he said he experimented with > various seeds in order to make sure the game it produced was interesting. > > I actually have a flash file I made that shows how a polynomial counter > routine works... > > Larry Kaplan said that polynomial counters were an outgrowth of a magazine > article that came out in the mid 70s on the subject, I think it was in Byte > magazine or something, and after that everyone started using them. > > > > - > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > --------------------------------------------------------------- NetZero Platinum Only $9.95 per month! Sign up in September to win one of 30 Hawaiian Vacations for 2! http://my.netzero.net/s/signup?r=platinum&refcd=PT97 - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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